Finding the Fourth Proportional to 525,619.89, 725,412.24 and 321,807.87

Step by Step Solution

1. Step 1: Write the proportion equation
   525,619.89 : 725,412.24 = 321,807.87 : x
2. Step 2: Convert to fraction form
   525,619.89/725,412.24 = 321,807.87/x
3. Step 3: Cross multiply
   525,619.89x = 725,412.24 × 321,807.87
4. Step 4: Simplify right side
   525,619.89x = 233,443,367,826.33
5. Step 5: Solve for x
   x = 233,443,367,826.33/525,619.89
6. Step 6: Final answer
   x = 444,129.63